Abstract
Apparent molar volumes, V φ, of glycine, DL-α-alanine, DL-α-amino-n-butyric acid, L-valine, L-leucine, and diglycine in water and in 1.0, 2.0, 3.0, 4.0, 5.0, and 6.0 m B [molality of n-propanol in water (mol-kg−1)] aqueous solutions of n-propanol have been obtained from densities of their solutions at 25 °C measured by using a precise vibrating-tube digital densimeter. The calculated partial molar volumes of amino acids and diglycine at infinite dilution, V 2,m o, have been used to obtain the corresponding transfer volumes, Δ tr V 2,m o, from water to different n-propanol–water mixtures. Δ tr V 2,m o values are positive for glycine, DL-α- alanine, and diglycine (except at lower concentration ∼1.0 m B ), negative for L-valine, and both positive and negative for the remaining amino acids over the concentration range studied. The side-chain contributions and hydration numbers have been calculated from V 2,m o data. Interaction coefficients have also been obtained from the McMillan–Mayer approach and the data have been interpreted in terms of various interactions.
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Banipal, T.S., Singh, G. Densities and Partial Molar Volumes of Some Amino Acids and Diglycine in Aqueous n-Propanol Solutions at 25°C. Journal of Solution Chemistry 32, 997–1015 (2003). https://doi.org/10.1023/B:JOSL.0000017064.81548.60
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DOI: https://doi.org/10.1023/B:JOSL.0000017064.81548.60